IN SITU HIGH-PRESSURE AND HIGH-TEMPERATURE BUBBLE GROWTH IN SILICIC MELTS
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dc.contributor.author | Martel C. | |
dc.contributor.author | Bureau H. | |
dc.date.accessioned | 2021-02-08T00:55:29Z | |
dc.date.available | 2021-02-08T00:55:29Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=780524 | |
dc.identifier.citation | Earth and Planetary Science Letters, 2001, 191, 1-2, 115-127 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24504 | |
dc.description.abstract | We present the first investigation of in situ high-pressure and high-temperature bubble growth in silicic melts. In a hydrothermal diamond-anvil cell, a haplogranite melt (79 wt% SiO2) is hydrated then subjected to cooling and decompression. With decreasing pressure, water exsolves from the melt and bubbles grow. The whole experiment is observed through an optical microscope and video-recorded, so that bubble nucleation, bubble growth, and the glass transition are directly monitored. Bubbles nucleate and expand in melt globules having radii from 15 to 70 μm. Bubbles reached 3.6-9.1 μm in radius within 6.1-11.7 s (until the glass transition is attained) while temperature decreases from 709-879°C to 482-524°C, corresponding to decompressions from 7.0-21.9 to 3.4-15.2 kbar. Bubbles nucleated either in a single event occurring within the first second or in successive pulses over a period of up to 7 s when the melt globules are in contact with a diamond culet of the cell. In these experiments, bubble growth can be fitted to the cube root or a logarithm of time, mainly ascribable to the combination of large water oversaturations due to rapid cooling and decompression. At pressures of 3.4-15.2 kbar, we measure glass transition temperatures that are 20-80°C higher than those calculated at atmospheric pressure. | |
dc.subject | BUBBLES | |
dc.subject | HIGH PRESSURE | |
dc.subject | HIGH TEMPERATURE | |
dc.subject | GROWTH RATES | |
dc.subject | SILICATE MELTS | |
dc.title | IN SITU HIGH-PRESSURE AND HIGH-TEMPERATURE BUBBLE GROWTH IN SILICIC MELTS | |
dc.type | Статья |
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